JQ: Extract value from object in nested array based on object name - jq

Question

I have tried learning jq, but I can't really seem to wrap my head properly around it. (JSON and jq Newb here)
I need to extract some values from "Devices", and I need to get one value from the "CustomAttributes" array. The big problem is that the position of the data I need isn't fixed within this array, so I have to find the right object based on the name.
I need to export this as a CSV.
The expected output is :
SerialNumber: "aaabbbccc"
EnrollmentUserName:"Donald"
os_vers: "10.15.7"
Does anyone have a recipe for this?
{
"Devices": [
{
"DeviceId": 111,
"Udid": "a813bf407aa55ed686f3d3ade3e6d3c4",
"SerialNumber": "aaabbbccc",
"EnrollmentUserName": "Donald",
"AssetNumber": "A813BF407AA55ED686F3D3ADE3E6D3C4",
"CustomAttributes": [
{
"Name": "reinstall",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "reinstall_keys",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "msc_version",
"Value": "4.1.4.3949",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "reinstall_ssh_log",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "cert_date",
"Value": "20210422",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "model_id",
"Value": "iMac14,2",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "cfengine",
"Value": "disabled",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "os_vers",
"Value": "10.15.7",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "xprotect_vers",
"Value": "2149",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "powerpoint",
"Value": "true",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
}
]
},
{
"DeviceId": 178,
"Udid": "72893dbe48755ac99641ab2a3b8a5228",
"SerialNumber": "CCCBBBAAA",
"EnrollmentUserName": "Mickey",
"AssetNumber": "",
"CustomAttributes": [
{
"Name": "MobileAccount",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "reinstall",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "reinstall_keys",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "reinstall_ssh_log",
"Value": "false",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "cert_date",
"Value": "20210422",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "model_id",
"Value": "MacBookPro12,1",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "dep_check",
"Value": "checked",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "cfengine",
"Value": "disabled",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
},
{
"Name": "os_vers",
"Value": "11.5.2",
"Source": "Device Sourced",
"Application": "AirWatchAgent"
}
]
}
],
"Page": 0,
"PageSize": 5,
"Total": 1831
}

Answer 1

This lists all triplets and a header row formatted as CSV:
jq --raw-output '
[ "SerialNumber", "EnrollmentUserName", "os_vers" ], # header
( .Devices[]
| [ .SerialNumber, .EnrollmentUserName,
(.CustomAttributes[] | select(.Name == "os_vers").Value)
]
)
| #csv
' input.json
"SerialNumber","EnrollmentUserName","os_vers"
"aaabbbccc","Donald","10.15.7"
"CCCBBBAAA","Mickey","11.5.2"
Demo
If you only need one specific line, leave out the header (marked with #header) and apply another select after .Devices[] according to your criterion (e.g. .EnrollmentUserName == "Donald").